. Author manuscript; available in PMC: 2017 May 1.

Published in final edited form as: Qual Life Res. 2015 Nov 21;25(5):1123–1130. doi: 10.1007/s11136-015-1162-9

Table 6.

Between-mode and within-mode measurement reliability for each scale

ICC	N^a	BFI total score	BFI dietary	BFI urgency	BFI frequency	LASA QOL	Adapted SSQ
Between-mode reliability
Web–IVRS	62	0.97 (0.95–0.98)	0.88 (0.83–0.94)	0.98 (0.97–0.99)	0.93 (0.90–0.96)	0.79 (0.69–0.87)	0.86 (0.79–0.92)
Web–paper	64	0.97 (0.95–0.98)	0.88 (0.83–0.93)	0.98 (0.97–0.99)	0.94 (0.91–0.97)	0.98 (0.97–0.99)	0.92 (0.88–0.95)
IVRS–paper	66	0.97 (0.95–0.98)	0.87 (0.83–0.92)	0.98 (0.96–0.99)	0.91 (0.86–0.95)	0.80 (0.71–0.89)	0.79 (0.70–0.88)
Within-mode reliability
Web–Web	33	0.97 (0.95–0.99)	0.88 (0.80–0.96)	0.97 (0.95–0.99)	0.96 (0.93–0.99)	0.99 (0.99–1.00)	0.97 (0.94–0.99)
IVRS–IVRS	28	0.95 (0.92–0.98)	0.73 (0.55–0.90)	0.93 (0.88–0.98)	0.95 (0.91–0.98)	0.49 (0.21–0.77)^b	0.74 (0.57–0.90)

BFI Memorial Sloan Kettering Cancer Center Bowel Function Instrument, LASA QOL Linear Analog Scale Assessment Quality of Life, SSQ Subjective Significance Questionnaire, IVRS interactive voice response system

Sample size (N) is indicated for the BFI total score

The low ICC for IVRS–IVRS is driven by two highly discordant pairs; without these two pairs the ICC is 0.89